www.ti.comTPS72501
TPS72515,TPS72516TPS72518,TPS72525
SLVS341D–MAY2002–REVISEDMARCH2004LOWINPUTVOLTAGE,1-ALOW-DROPOUTLINEARREGULATORSWITHSUPERVISOR
FEATURES
••
1-AOutputCurrent
Availablein1.5-V,1.6-V,1.8-V,2.5-VFixed-OutputandAdjustableVersions(1.2-Vto5.5-V)
InputVoltageDownto1.8V
Low170-mVDropoutVoltageat1A(TPS72525)
StableWithAnyType/ValueOutputCapacitorIntegratedSupervisor(SVS)With50-msRESETDelayTime
Low210-µAGroundCurrentatFullLoad(TPS72525)
Lessthan1-µAStandbyCurrent
±2%OutputVoltageToleranceOverLine,Load,andTemperature(-40°Cto125°C)IntegratedUVLO
ThermalandOvercurrentProtection
5-LeadSOT223-5orDDPAKand8-PinSOP(TPS72501only)SurfaceMountPackage
DESCRIPTION
TheTPS725xxfamilyof1-Alow-dropout(LDO)linearregulatorshasfixedvoltageoptionsavailablethatarecommonlyusedtopowerthelatestDSPs,FPGAs,andmicrocontrollers.Anadjustableoptionrangingfrom1.22Vto5.5Visalsoavailable.TheintegratedsupervisorycircuitryprovidesanactivelowRESETsignalwhentheoutputfallsoutofregulation.Thenocapacitor/anycapacitorfeatureallowsthecustomertotailoroutputtransientperformanceasneeded.Therefore,comparedtootherregulatorscapableofprovidingthesameoutputcurrent,thisfamilyofregulatorscanprovideastand-alonepowersupplysolutionorapostregulatorforaswitchmodepowersupply.
Theseregulatorsareidealforhighercurrentappli-cations.Thefamilyoperatesoverawiderangeofinputvoltages(1.8Vto6V)andhasverylowdropout(170mVat1-A).
Groundcurrentistypically210µAatfullloadanddropstolessthan80µAatnoload.Standbycurrentislessthan1µA.
EachregulatoroptionisavailableineitheraSOT223-5,D(TPS72501only),orDDPAKpackage.Withalowinputvoltageandproperlyheatsinkedpackage,theregulatordissipatesmorepowerandachieveshigherefficienciesthansimilarregulatorsrequiring2.5Vormoreminimuminputvoltageandhigherquiescentcurrents.Thesefeaturesmakeitaviablepowersupplysolutionforportable,bat-tery-poweredequipment.
D PACKAGE(TOP VIEW)
••••••••••
APPLICATIONS
•••••
PCICardsModemBanksTelecomBoards
DSP,FPGA,andMicroprocessorPowerSupplies
Portable,Battery-PoweredApplications
DCQ PACKAGESOT223-5(TOP VIEW)
ENABLEINGNDOUTRESET/FB12345
12345
KTT PACKAGE
DDPAK(TOP VIEW)
OUTFBGNDNC
1234
8765
INGNDGNDENABLE
ENABLEINGNDOUTRESET/FBNC − No internal connection
NOTE:TPS72501replacesRESETwithFB.TabisGNDfortheDCKandKTTpackages.
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
Copyright©2002–2004,TexasInstrumentsIncorporated
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Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
Althoughanoutputcapacitorisnotrequiredforstability,transientresponseandoutputnoiseareimprovedwitha10-µFoutputcapacitor.
Unlikesomeregulatorsthathaveaminimumcurrentrequirement,theTPS725familyisstablewithnooutputloadcurrent.Thelownoisecapabilityofthisfamily,coupledwithitshighcurrentoperationandeaseofpowerdissipation,makeitidealfortelecomboards,modembanks,andothernoise-sensitiveapplications.
ORDERINGINFORMATION
TJVOLTAGE(1)Adjustable(1.2Vto5V)1.5V-40°Cto125°C1.6V1.8V2.5V(1)(2)(3)(4)
SOT223-5(2)TPS72501DCQTPS72515DCQTPS72516DCQTPS72518DCQTPS72525DCQSYMBOLPS72501PS72515PS72516PS72518PS72525DDPAK(3)TPS72501KTTTPS72515KTTTPS72516KTTTPS72518KTTTPS72525KTTD(4)TPS72501D————SYMBOLTPS72501TPS72515TPS72516TPS72518TPS72525Othervoltageoptionsareavailableuponrequestfromthemanufacturer.
Toorderatapedandreeledpart,addthesuffixRtothepartnumber(e.g.,TPS72501DCQR).
Toordera50-piecereel,addthesuffixT(e.g.,TPS72501KTTT);toordera500-piecereel,addthesuffixR(e.g.,TPS72501KTTR).Toorderatapedandreeledpart,addthesuffixRorT(2500or500)tothepartnumber(e.g.TPS72501DR)
overoperatingfree-airtemperaturerangeunlessotherwisenoted(1)
UNITInputvoltage,VI(2)-0.3to7-0.3toVI+0.362-50to150150-65to150VVVkV°C°C°CVoltagerangeatEN,FBVoltageonOUT,RESETESDrating,HBMContinuoustotalpowerdissipationOperatingjunctiontemperaturerange,TJMaximumjunctiontemperaturerange,TJStoragetemperature,Tstg(1)(2)
SeeDissipationRatingsTableStressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.Allvoltagevaluesarewithrespecttonetworkgroundterminal.
MINNOMMAXUNITInputvoltage,VI(1)1.80-4061125VA°CContinuousoutputcurrent,IOOperatingjunctiontemperature,TJ(1)
MinimumVI=VO(nom)+VDO.
2
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TPS72501
TPS72515,TPS72516TPS72518,TPS72525
SLVS341D–MAY2002–REVISEDMARCH2004
PACKAGEDISSIPATIONRATINGS
PACKAGEDDPAKSOT223D-8(1)(2)
BOARDHighK(1)LowK(2)HighK(1)RθJC2°C/W15°C/W39.4°C/WRθJA23°C/W53°C/W55°C/WTheJEDEChigh-K(2s2p)boarddesignusedtoderivethisdatawasa3-inchx3-inch(7.5-cmx7.5-cm),multilayerboardwith1ounceinternalpowerandgroundplanesand2ouncecoppertracesontopandbottomoftheboard.
TheJEDEClow-K(1s)boarddesignusedtoderivethisdatawasa3-inchx3-inch(7.5-cmx7.5-cm),two-layerboardwith2ouncecoppertracesontopoftheboard.
ELECTRICALCHARACTERISTICS
overrecommendedoperatingfree-airtemperaturerangeVI=VO(typ)+1V,IO=1mA,EN=IN,Co=1µF,Ci=1µF(unlessotherwisenoted)
PARAMETERBandgapvoltagereferenceTPS72501AdjustableTPS72515VOOutputvoltageTPS72516TPS72518TPS72525IGroundcurrentStandbycurrentVnPSRROutputnoisevoltageRipplerejectionCurrentlimit(2)Outputvoltagelineregulation(∆VO/VO)(3)OutputvoltageloadregulationVIHVILIII(FB)ENhighlevelinput(2)ENlowlevelinput(2)ENinputcurrentFeedbackcurrentUVLOthresholdUVLOhysteresisUVLOdeglitchUVLOdelay(1)(2)(3)
EN=0VorVITPS72501VCCrisingTJ=25°C,VCCrisingTJ=25°C,VCCrisingTJ=25°C,VCCrisingV(FB)=1.22-1001.451.575010100VO+1V 100MinimumINoperatingvoltageusedfortestingisVO(typ)+1V. TestconditionincludesoutputvoltageVO=VO-15%andpulseduration=10ms.VImin=(VO+1)or1.8Vwhicheverisgreater. 3 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com ELECTRICALCHARACTERISTICS(continued) overrecommendedoperatingfree-airtemperaturerangeVI=VO(typ)+1V,IO=1mA,EN=IN,Co=1µF,Ci=1µF(unlessotherwisenoted) PARAMETERTPS72525VDODropoutvoltageTPS72518MinimuminputvoltageforvalidRESETTripthresholdvoltageHysteresisvoltageRESETt(RESET)delaytimeRisingedgedeglitchOutputlowvoltage(at700µA)Leakagecurrent(4) -0.325(4)(4)TESTCONDITIONSIO=1AIO=1AIO=1AIO=1ATJ=25°CTJ=25°CMINTYP170MAX280UNIT2103201.390931050100.41007596mVV%VOmVmsµsVnADropoutvoltageisdefinedasthedifferentialvoltagebetweenVOandVIwhenVOdrops100mVbelowthevaluemeasuredwithVI=VO+1V. 4 元器件交易网www.cecb2b.com www.ti.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 FUNCTIONALBLOCKDIAGRAM—ADJUSTABLEVERSION TPS72501INEN 1.220VrefGND CurrentLimit/ThermalProtectionOUT FB FUNCTIONALBLOCKDIAGRAM—FIXEDVERSION TPS72515/16/18/25 INEN1.220VrefGND CurrentLimit/ThermalProtectionOUT DeglitchandDelay0.93× VrefRESETTERMINALFUNCTIONS TERMINALNAMEENABLEFBGNDINRESET/FBNO.D523,6,78—325IO/INO.DCQ&KTT1I/ODESCRIPTIONIEnableinputFeedbackGroundInputsupplyvoltageThisterminalisthefeedbackpointfortheadjustableoptionTPS72501.Forallotheroptions,thisterminalistheRESEToutputterminal.Whenusedwithapullupresistor,thisopen-drainoutputprovidestheactivelowRESETsignalwhentheregulatoroutputvoltagedropsmorethan5%belowitsnominaloutputvoltage.TheRESETdelaytimeistypically50ms.NoconnectionRegulatedoutputvoltageNCOUT41—4O5 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com RESETTIMINGDIAGRAM IN VRES(see Note A)OUTThresholdVoltageVIT–(see Note B)VIT–(see Note B)VIT+(see Note B)VIT+(see Note B)VRESttRESETOutput50 msDelay50 msDelayOutputUndefinedOutputUndefinedtNOTES:A.VRES is the minimum input voltage for a valid RESET. The symbol VRES is not currently listed within EIA or JEDEC standards for semiconductor symbology. B.VIT –Trip voltage is typically 7% lower than the output voltage (93%VO) VIT– to VIT+ is the hysteresis voltage. 6 元器件交易网www.cecb2b.com www.ti.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 TYPICALCHARACTERISTICS TPS72518 OUTPUTVOLTAGE vs OUTPUTCURRENT 1.80151.801VO− Output Voltage − VVI = 2.8 VCo = 1 µFTJ = 25°C1.805VI = 2.8 VCo = 1 µFVO− Output Voltage − V1.800IO = 0 mAGround Current − µA200TPS72518 OUTPUTVOLTAGE vs JUNCTIONTEMPERATURE 250TPS72518 GROUNDCURRENT vs JUNCTIONTEMPERATURE VI = 2.8 VCo = 1 µFTJ = 25°CIO = 1 A1.80051.81.79951.7991.798500.20.40.60.81IO − Output Current − A 1501.795100IO = 0 mA1.790IO = 1 A501.785−40−25−105203550658095110125TJ − Junction Temperature − °C 0−40−25−105203550658095110125TJ − Junction Temperature − °C Figure1.TPS72518 GROUNDCURRENT vs OUTPUTCURRENT 200175Ground Current − µA15012510075502500.01 VDO− Dropout Voltage − mV300Figure2. TPS72525 DCDROPOUTVOLTAGE vs OUTPUTCURRENT 300VO = 2.5 V (nom)VDO− Dropout Voltage − mV250200150100500TJ = −40°CTJ = 25°CTJ = 125°C250200150100500−40−25−105Figure3. TPS72518 DROPOUTVOLTAGE vs JUNCTIONTEMPERATURE VO = 1.7 VCo = 1 µFIO = 1 AIO = 10 mA2035506580951101250.1110100100000.2IO − Output Current − mA 0.40.60.8IO − Output Current − A 1TJ − Junction Temperature − °C Figure4. MINIMUMREQUIREDINPUTVOLTAGE vs OUTPUTVOLTAGE VI− Input Voltage − V4.5VI− Minimum Required Input Voltage − V3.8Figure5.Figure6. TPS72518 LINETRANSIENTRESPONSE Output Voltage − mV∆VO− Change inIO = 1 ACo = 10 µF1000−100TPS72518 LOADTRANSIENTRESPONSE VO = 2.8 VCo = 10 µFCi = 1 µF43.5TJ = 25°CTJ = 125°C2.83VO− Output Voltage − mVIO− Output Current − A2.5TJ = −40°C21.51.522.533.4.5VO − Output Voltage − V 1000−100050100150200250300350400450500t − Time − µs 10.50051015202530304550t − Time − µs Figure7.Figure8.Figure9. 7 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com TYPICALCHARACTERISTICS(continued) TPS72518OUTPUTVOLTAGE, ENABLEVOLTAGE vs TIME(START-UP) Enable Voltage − VVI− Input Voltage − V32102VO− Output Voltage − V1.510.50020406080100120140160180200t − Time − µs VI = 2.8 VIO = 1 ACo = 10 µF3210VOTPS72518 LOADTRASIENTRESPONSE Output Voltage − mV∆VO− Change in1000−100VI = 2.8 VCo = 1 µFCI = 1 µFTPS72518 POWERUP/POWERDOWN RL = 1.8 ΩCo = 1 µFCi = 1 µFVII − Output Current − AO10.5005101520253030t − Time − µs 4550V − Output Voltage − VO01002003004005006007008009001000t − Time − µs Figure10. TPS72518OUTPUTSPECTRAL NOISEDENSITY vs FREQUENCY Hz3.532.52IO = 1 A1.510.50101001 k10 kf − Frequency − Hz 100 kIO = 1 mAVI = 2.8 VCo = 10 µFFigure11.Figure12.TPS72518 RIPPLEREJECTION vs FREQUENCY 10090VI= 2.8 V,VO = 1.8 V,CO = 10 µFOUTPUTIMPEDANCE vs FREQUENCY 10IO = 1 A1IO = 1 mARipple Rejection − dBOutput Spectral Noise Density − µV/Zo− Output Impedance −Ω8070605040302010010 µF / 1 A10 µF / 1mA0.10.01010VI = 2.8 VCo = 10 µFTJ = 25°C1001 k10 k100 k1 M101001 k10 k100 k1 Mf − Frequency − Hz f − Frequency − Hz Figure13.CURRENTLIMIT vs INPUTVOLTAGE 200019001800Current Limit − A170016001500140013001200110010001.522.533.4.555.50012TJ = 25°CTJ = −40°CTJ = 125°CGround Current −µA600500400300200Figure14. TPS72515GROUNDCURRENT vs INPUTVOLTAGE 300250200150100Figure15.DROPOUTVOLTAGE vs INPUTVOLTAGE TJ = 125°CTJ = 25°CI = 1 AVDO− Dropout Voltage − mVI = 0 A100TJ = −40°C50034561.52VI − Input voltage − VVI − Input Voltage − V 2.533.4.5VI − Input Voltage − V 55.5Figure16.Figure17.Figure18. 8 元器件交易网www.cecb2b.com www.ti.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 APPLICATIONINFORMATION TheTPS725xxfamilyoflow-dropout(LDO)regulatorshasnumerousfeaturesthatmakeitapplicabletoawiderangeofapplications.Thefamilyoperateswithverylowinputvoltage(≥1.8V)andlowdropoutvoltage(typically200mVatfullload),makingitanefficientstand-alonepowersupplyorpostregulatorforbatteryorswitchmodepowersupplies.BoththeactivelowRESETand1-AoutputcurrentmaketheTPS725xxfamilyidealforpoweringprocessorandFPGAsupplies.TheTPS725xxfamilyalsohaslowoutputnoise(typically150µVRMSwith10-µFoutputcapacitor),makingitidealforuseintelecomequipment. ExternalCapacitorRequirements A1-µForlargerceramicinputbypasscapacitor,connectedbetweenINandGNDandlocatedclosetotheTPS725xx,isrequiredforstability.Toimprovetransientresponse,noiserejection,andripplerejection,anadditional10-µForlarger,lowESRcapacitorisrecommended.Ahigher-value,lowESRinputcapacitormaybenecessaryiflarge,fast-rise-timeloadtransientsareanticipatedandthedeviceislocatedseveralinchesfromthepowersource,especiallyiftheminimuminputvoltageof1.8Visused. Althoughanoutputcapacitorisnotrequiredforstability,transientresponseandoutputnoiseareimprovedwitha10-µFoutputcapacitor. ProgrammingtheTPS72501AdjustableLDORegulator TheoutputvoltageoftheTPS72501adjustableregulatorisprogrammedusinganexternalresistordividerasshowninFigure19.Theoutputvoltageiscalculatedusing: VO+V 1)R1refR2 ńǒ(1) Where: •VFB=VREF=1.22Vtypical(seetheelectricalcharacteristicsforVREFrange) ResistorsR1andR2shouldbechosenforapproximately10-µAdividercurrent.Lowervalueresistorsoffernoinherentadvantageandwastemorepower.HighervaluesshouldbeavoidedasleakagecurrentsatFBincreasetheoutputvoltageerror.TherecommendeddesignprocedureistochooseR2=120kΩtosetthedividercurrentat10µAandthencalculateR1using: R1+ ń O)1Vref V ǒ R2 (2) TPS72501OUTPUT VOLTAGEPROGRAMMING GUIDE(Standard 1% Resistor Values) PROGRAMVOLTAGE VI1 µF≥ 1.3 V≤0.4 VINR1 (KΩ)R2 (kΩ)VOLTAGE56.2127196205 118121115105 1.8012.5003.2993.602 ACTUAL ENOUTR1FBGND1.22 VR2VOCo 1.8 V2.5 V3.3 V3.6 V Figure19.TPS72501AdjustableLDORegulatorProgramming 9 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com APPLICATIONINFORMATION(continued)RegulatorProtection TheTPS725xxpasselementhasabuilt-inbackdiodethatsafelyconductsreversecurrentwhentheinputvoltagedropsbelowtheoutputvoltage(e.g.,duringpowerdown).Currentisconductedfromtheoutputtotheinputandisnotinternallylimited.Ifextendedreversevoltageisanticipated,externallimitingmightbeappropriate. TheTPS725xxalsofeaturesinternalcurrentlimitingandthermalprotection.Duringnormaloperation,theTPS725xxlimitsoutputcurrenttoapproximately1.6A.Whencurrentlimitingengages,theoutputvoltagescalesbacklinearlyuntiltheovercurrentconditionends.Whilecurrentlimitingisdesignedtopreventgrossdevicefailure,careshouldbetakennottoexceedthepowerdissipationratingsofthepackage.Ifthetemperatureofthedeviceexceeds165°C,thermal-protectioncircuitryshutsitdown.Oncethedevicehascooleddowntobelow145°C,regulatoroperationresumes. THERMALINFORMATION TheamountofheatthatanLDOlinearregulatorgeneratesisdirectlyproportionaltotheamountofpoweritdissipatesduringoperation.Allintegratedcircuitshaveamaximumallowablejunctiontemperature(TJmax)abovewhichnormaloperationisnotassured.Asystemdesignermustdesigntheoperatingenvironmentsothattheoperatingjunctiontemperature(TJ)doesnotexceedthemaximumjunctiontemperature(TJmax).Thetwomainenvironmentalvariablesthatadesignercanusetoimprovethermalperformanceareairflowandexternalheatsinks.Thepurposeofthisinformationistoaidthedesignerindeterminingtheproperoperatingenvironmentforalinearregulatorthatisoperatingataspecificpowerlevel. Ingeneral,themaximumexpectedpower(PD(max))consumedbyalinearregulatoriscomputedas: PmaxńV+V I)VxIDI(avg)O(avg)O(avg)I(avg)(Q) ǒ Ǔ (3) Where: •VI(avg)istheaverageinputvoltage.•VO(avg)istheaverageoutputvoltage.•IO(avg)istheaverageoutputcurrent.•I(Q)isthequiescentcurrent. FormostTILDOregulators,thequiescentcurrentisinsignificantcomparedtotheaverageoutputcurrent;therefore,thetermVI(avg)xI(Q)canbeneglected.Theoperatingjunctiontemperatureiscomputedbyaddingtheambienttemperature(TA)andtheincreaseintemperatureduetotheregulator'spowerdissipation.Thetemperatureriseiscomputedbymultiplyingthemaximumexpectedpowerdissipationbythesumofthethermalresistancesbetweenthejunctionandthecase(RθJC),thecasetoheatsink(RθCS),andtheheatsinktoambient(RθSA).Thermalresistancesaremeasuresofhoweffectivelyanobjectdissipatesheat.Typically,thelargerthedevice,themoresurfaceareaavailableforpowerdissipationandthelowertheobject'sthermalresistance.Figure20illustratesthesethermalresistancesfor(a)aSOT223packagemountedinaJEDEClow-Kboard,and(b)aDDPAKpackagemountedonaJEDEChigh-Kboard. 10 元器件交易网www.cecb2b.com www.ti.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 THERMALINFORMATION(continued) A CIRCUIT BOARD COPPER AREA CBA RθJC BRθCS CRθSA DDPAK Package (b) CTCTJ ABSOT223 Package (a) TA Figure20.ThermalResistances Equation4summarizesthecomputation: TJ )T PDmaxxR R R AθJCθCSθSA + ń (4) TheRθJCisspecifictoeachregulatorasdeterminedbyitspackage,leadframe,anddiesizeprovidedinthe regulator'sdatasheet.TheRθSAisafunctionofthetypeandsizeofheatsink.Forexample,blackbodyradiatortypeheatsinkscanhaveRθCSvaluesrangingfrom5°C/Wforverylargeheatsinksto50°C/Wforverysmallheatsinks.TheRθCSisafunctionofhowthepackageisattachedtotheheatsink.Forexample,ifathermalcompoundisusedtoattachaheatsinktoaSOT223package,RθCSof1°C/Wisreasonable. Evenifnoexternalblackbodyradiatortypeheatsinkisattachedtothepackage,theboardonwhichtheregulatorismountedprovidessomeheatsinkingthroughthepinsolderconnections.Somepackages,liketheDDPAKandSOT223packages,useacopperplaneunderneaththepackageorthecircuitboard'sgroundplaneforadditionalheatsinkingtoimprovetheirthermalperformance.Computer-aidedthermalmodelingcanbeusedtocomputeveryaccurateapproximationsofanintegratedcircuit'sthermalperformanceindifferentoperatingenvironments(e.g.,differenttypesofcircuitboards,differenttypesandsizesofheatsinks,differentairflows,etc.).Usingthesemodels,thethreethermalresistancescanbecombinedintoonethermalresistancebetweenjunctionandambient(RθJA).ThisRθJAisvalidonlyforthespecificoperatingenvironmentusedinthecomputermodel. Equation4simplifiesintoEquation5:T)T PDmaxxRJAθJARearrangingEquation5givesEquation6: T–T R JAθJAPmax D (5) (6) UsingEquation5andthecomputermodelgeneratedcurvesshowninFigure21andFigure24,adesignercanquicklycomputetherequiredheatsinkthermalresistance/boardareaforagivenambienttemperature,powerdissipation,andoperatingenvironment. DDPAKPowerDissipation TheDDPAKpackageprovidesaneffectivemeansofmanagingpowerdissipationinsurfacemountapplications.TheDDPAKpackagedimensionsareprovidedintheMechanicalDatasectionattheendofthedatasheet.TheadditionofacopperplanedirectlyunderneaththeDDPAKpackageenhancesthethermalperformanceofthepackage. 11 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com THERMALINFORMATION(continued) Toillustrate,theTPS72525inaDDPAKpackagewaschosen.Forthisexample,theaverageinputvoltageis5V,theoutputvoltageis2.5V,theaverageoutputcurrentis1A,theambienttemperature55°C,theairflowis150LFM,andtheoperatingenvironmentisthesameasdocumentedbelow.Neglectingthequiescentcurrent,themaximumaveragepoweris: PDmax)(5 2.5)Vx1A)2.5W(7)SubstitutingTJmaxforTJintoEquation6givesEquation8:Rmax)(125 55)°C+2.5W)28°C+WθJA (8) FromFigure21,DDPAKThermalResistancevsCopperHeatsinkArea,thegroundplaneneedstobe1cm2fortheparttodissipate2.5W.TheoperatingenvironmentusedinthecomputermodeltoconstructFigure21consistedofastandardJEDECHigh-Kboard(2S2P)witha1oz.internalcopperplaneandgroundplane.Thepackageissolderedtoa2oz.copperpad.Thepadistiedthroughthermalviastothe1oz.groundplane.Figure22showsthesideviewoftheoperatingenvironmentusedinthecomputermodel. 40No Air FlowRθJA− Thermal Resistance − °C/W35150 LFM30250 LFM2520150.1110Copper Heatsink Area − cm2 100Figure21.DDPAKThermalResistancevsCopperHeatsinkArea 2 oz. Copper Solder Padwith 25 Thermal Vias1 oz. CopperPower Plane1 oz. CopperGround PlaneThermal Vias, 0.3 mmDiameter, 1,5 mm Pitch Figure22.DDPAKThermalResistance 12 元器件交易网www.cecb2b.com www.ti.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 THERMALINFORMATION(continued) FromthedatainFigure23andrearrangingEquation6,themaximumpowerdissipationforadifferentgroundplaneareaandaspecificambienttemperaturecanbecomputed. TA = 55°CPD− Maximum Power Dissipation − WTJM− Maximum Junction Temperature − 125°C100250 LFM150 LFM3No Air Flow210.1110Copper Heatsink Area − cm2 Figure23.MaximumPowerDissipationvsCopperHeatsinkArea SOT223PowerDissipation TheSOT223packageprovidesaneffectivemeansofmanagingpowerdissipationinsurfacemountapplications.TheSOT223packagedimensionsareprovidedintheMechanicalDatasectionattheendofthedatasheet.TheadditionofacopperplanedirectlyunderneaththeSOT223packageenhancesthethermalperformanceofthepackage. Toillustrate,theTPS72525inaSOT223packagewaschosen.Forthisexample,theaverageinputvoltageis3.3V,theoutputvoltageis2.5V,theaverageoutputcurrentis1A,theambienttemperature55°C,noairflowispresent,andtheoperatingenvironmentisthesameasdocumentedbelow.Neglectingthequiescentcurrent,themaximumaveragepoweris: PDmax)(3.3 2.5)Vx1A)800mW(9)SubstitutingTJmaxforTJintoEquation6givesEquation10:Rmax)(125 55)°C+800mW)87.5°C+WθJA (10) FromFigure24,RΘJAvsPCBCopperArea,thegroundplaneneedstobe0.55in2fortheparttodissipate800mW.TheoperatingenvironmentusedtoconstructFigure24consistedofaboardwith1oz.copperplanes.Thepackageissolderedtoa1oz.copperpadonthetopoftheboard.Thepadistiedthroughthermalviastothe1oz.groundplane. 13 元器件交易网www.cecb2b.com TPS72501 TPS72515,TPS72516TPS72518,TPS72525 SLVS341D–MAY2002–REVISEDMARCH2004 www.ti.com THERMALINFORMATION(continued) 180RθJA− Thermal Resistance − °C/W1601401201008060402000.11PCB Copper Area − in2 10No Air FlowFigure24.SOT223ThermalResistancevsPCBAREA FromthedatainFigure24andrearrangingEquation6,themaximumpowerdissipationforadifferentgroundplaneareaandaspecificambienttemperaturecanbecomputed(asshowninFigure25). 6TA = 25°CPD− Maximum Power Dissipation − W4 in2 PCB Area30.5 in2 PCB Area2100255075100125150TA − Ambient Temperature − °C Figure25.SOT223PowerDissipation 14 元器件交易网www.cecb2b.com PACKAGEOPTIONADDENDUM www.ti.com 16-Mar-2007 PACKAGINGINFORMATION OrderableDeviceTPS72501DCQTPS72501DCQG4TPS72501DCQRTPS72501DCQRG4TPS72501DRTPS72501DRG4TPS72501DTTPS72501DTG4TPS72501KTTTPS72501KTTRTPS72501KTTRG3TPS72501KTTTTPS72501KTTTG3TPS72515DCQTPS72515DCQG4TPS72515DCQRTPS72515DCQRG4TPS72515KTTTPS72515KTTRTPS72515KTTRG3TPS72515KTTTTPS72515KTTTG3TPS72516DCQTPS72516DCQG4TPS72516DCQR Status(1)ACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVE PackageTypeSOT-223SOT-223SOT-223SOT-223SOICSOICSOICSOICDDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223 PackageDrawingDCQDCQDCQDCQDDDDKTTKTTKTTKTTKTTDCQDCQDCQDCQKTTKTTKTTKTTKTTDCQDCQDCQ PinsPackageEcoPlan(2) Qty6666888855555666655555666 50050050507878500500505078787878 Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAU MSLPeakTemp(3)Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEAR 2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br)250250 Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) TBDGreen(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) 2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br) TBDGreen(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) 2500Green(RoHS& noSb/Br) Addendum-Page1 元器件交易网www.cecb2b.com PACKAGEOPTIONADDENDUM www.ti.com 16-Mar-2007 OrderableDeviceTPS72516DCQRG4TPS72516KTTTPS72516KTTRTPS72516KTTRG3TPS72516KTTTTPS72516KTTTG3TPS72518DCQTPS72518DCQG4TPS72518DCQRTPS72518DCQRG4TPS72518KTTTPS72518KTTRTPS72518KTTRG3TPS72518KTTTTPS72518KTTTG3TPS72525DCQTPS72525DCQG4TPS72525DCQRTPS72525DCQRG4TPS72525KTTTPS72525KTTRTPS72525KTTRG3TPS72525KTTTTPS72525KTTTG3 (1) Status(1)ACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVE PackageTypeSOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263 PackageDrawingDCQKTTKTTKTTKTTKTTDCQDCQDCQDCQKTTKTTKTTKTTKTTDCQDCQDCQDCQKTTKTTKTTKTTKTT PinsPackageEcoPlan(2) Qty655555666655555666655555 50050050505005005050787850050050507878 2500Green(RoHS& noSb/Br) TBDGreen(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) Lead/BallFinishCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSN MSLPeakTemp(3)Level-2-260C-1YEARCallTI Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEAR 2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br) TBDGreen(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) 2500Green(RoHS& noSb/Br)2500Green(RoHS& noSb/Br) TBDGreen(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br) Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns. LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect. Addendum-Page2 元器件交易网www.cecb2b.com PACKAGEOPTIONADDENDUM www.ti.com 16-Mar-2007 NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign. PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable.OBSOLETE:TIhasdiscontinuedtheproductionofthedevice. (2) EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-Free/Greenconversionplanhasnotbeendefined. Pb-Free(RoHS):TI'sterms\"Lead-Free\"or\"Pb-Free\"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses. Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove. Green(RoHS&noSb/Br):TIdefines\"Green\"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial) (3) MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature. 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